Sprinkler base



FIG. 1 is a perspective view of a sprinkler base according to the invention;

FIG. 2 is a front elevational view of the sprinkler base of FIG. 1, the rear view of the sprinkler base being identical;

FIG. 3 is a top plan view of the sprinkler base of FIG. 1;

FIG. 4 is a left side elevational view of the sprinkler base of FIG. 1, the right side being identical; and,

FIG. 5 is a bottom view of the sprinkler base of FIG. 1. 

The ornamental design for a sprinkler base, as shown and described. 